Just updated explain.depesz.com site with new functionality – when showing parsed plan, there is new tab “stats". In there you can see some basic statistics of the query, used types of nodes, and tables that were used by it.

There are probably some problems with stats (it's new functionality, so bugs are imminent), but

As usual, some stats need to be added 🙂

Total count of plans in database: 18127

Count of private (not listed on history page) plans: 6965

Count of anonymized plans: 166 (this feature proved to be much less used than I thought it will be)

Since (including) May 2011, there are more private plans added than public ones. In June – 58.9% of all plans were private.